1. LIGHT Waves carry energy from one place to another © 2000 Microsoft Clip Gallery

2. LIGHT: What Is It? Light Energy Atoms As atoms absorb energy, electrons jump out to a higher energy level. Electrons release light when falling down to the lower energy level. Photons - bundles/packets of energy released when the electrons fall. Light: Stream of Photons © 2000 Microsoft Clip Gallery

3. Electromagnetic Waves Speed in Vacuum 300,000 km/sec 186,000 mi/sec Speed in Other Materials Slower in Air, Water, Glass © 2000 Microsoft Clip Gallery

4. Electromagnetic Spectrum © 2000 Microsoft Clip Gallery

5. Electromagnetic Spectrum Visible Spectrum – Light we can see Roy G. Biv – Acronym for Red, Orange, Yellow, Green, Blue, Indigo, & Violet. Largest to Smallest Wavelength.

6. Color of Light Transparent Objects: Light transmitted because of no scattering Color transmitted is color you see. All other colors are absorbed. Translucent: Light is scattered and transmitted some. Opaque: Light is either reflected or absorbed. Color of opaque objects is color it reflects. © 2000 Microsoft Clip Gallery

7. Color of Light (Cont.) Color of Objects White light is the presence of ALL the colors of the visible spectrum. Black objects absorb ALL the colors and no light is reflected back. © 2000 Microsoft Clip Gallery

8. Color of Light (Cont.) Primary Colors of Light Three colors that can be mixed to produce any other colored light Red + blue + green = white light Complimentary Colors of Light Two complimentary colors combine to make white light-Magenta,Cyan,Yellow © 2000 Microsoft Clip Gallery

9. Paint Pigments Pigments absorb the frequency of light that you don’t see and reflects the color that you do see. Primary pigments Yellow + cyan + magenta = black Primary pigments are compliments of the primary colors of light. © 2000 Microsoft Clip Gallery

10. Complementary Pigments Green, blue, red Complimentary pigments are primary colors for light! © 2000 Microsoft Clip Gallery

11. LIGHT & ITS USES Sources of Light Incandescent light – light produced by heating an object until it glows. © 2000 Microsoft Clip Gallery

12. LIGHT & ITS USES Fluorescent Light – Light produced by electron bombardment of gas molecules Phosphors absorb photons that are created when mercury gas gets zapped with electrons. The phosphors glow & produce light. © 2000 Microsoft Clip Gallery

13. LIGHT & ITS USES - Neon Neon light – neon inside glass tubes makes red light. Other gases make other colors. © 2000 Microsoft Clip Gallery

14. LIGHT & USES: Optical Instruments LASERS Acronym: Light Amplification by Stimulated Emission of Radiation Coherent Light – Waves are in phase so it is VERY powerful & VERY intense.

15. LIGHT & USES: Optical Instruments LASERS Holography – Use of Lasers to create 3-D images Fiber Optics – Light energy transferred through long, flexible fibers of glass/plastic Uses – Communications, medicine, t.v. transmission, data processing.